前言目的探讨下颈椎不稳与颈椎后纵韧带骨化症（OPLL）早期发病的关系。方法对76例OPLL患者及30例正常人行颈椎X线摄片、CT及MRI检查。在颈椎屈曲/伸展侧位片上测量全颈椎活动范围、椎体水平移位及成角程度,根据MRIT2加权像观察脊髓内高信号变化,并与临床资料对比分析。结果OPLL患者颈椎屈伸范围比正常人明显减小（P<0。01）,下颈椎不稳发生率比正常人明显增高（P<0。01）。OPLL合并下颈椎不稳的患者,神经系统受损程度和脊髓受压程度不平行,产生重于影像学表现的临床症状。结论下颈椎不稳加速OPLL症的发生和发展。
ObjectiveToevaluatetheeffectoflowercervicalinstabilityontheonsetofcervicalossificationoftheposteriorlongitudinalligament（OPLL）.Methods76patientswithcervicalOPLLand30healthyvolunteerswereanalyzedfortherangeofmotionofthecervicalspineandhorizontaldisplacementsandangulardisplacementsonlateraldynamicradiographs.IntramedullaryhighintensitylesionswereobservedonT2weightedMRI.Clinicalsymptomswerestudied,andfactorsrelatingtotheonsetofmyelopath...
